US20220055318A1 - Method for producing a welded connection, and welding device - Google Patents

Method for producing a welded connection, and welding device Download PDF

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Publication number
US20220055318A1
US20220055318A1 US17/275,066 US201917275066A US2022055318A1 US 20220055318 A1 US20220055318 A1 US 20220055318A1 US 201917275066 A US201917275066 A US 201917275066A US 2022055318 A1 US2022055318 A1 US 2022055318A1
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United States
Prior art keywords
welding
target value
error
connecting element
conductor resistance
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Granted
Application number
US17/275,066
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English (en)
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US11987010B2 (en
Inventor
Albert Lueghamer
Gerald Severa
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Agru Kunststofftechnik GmbH
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Agru Kunststofftechnik GmbH
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Assigned to AGRU KUNSTSTOFFTECHNIK GESELLSCHAFT M.B.H. reassignment AGRU KUNSTSTOFFTECHNIK GESELLSCHAFT M.B.H. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LUEGHAMER, ALBERT, SEVERA, GERALD
Publication of US20220055318A1 publication Critical patent/US20220055318A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B29C66/9672—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes involving special data inputs, e.g. involving barcodes, RFID tags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B29C65/24—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools characterised by the means for heating the tool
    • B29C65/30—Electrical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3404—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint
    • B29C65/342—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the type of heated elements which remain in the joint comprising at least a single wire, e.g. in the form of a winding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/3468—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" characterised by the means for supplying heat to said heated elements which remain in the join, e.g. special electrical connectors of windings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1222—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a lapped joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/12—Joint cross-sections combining only two joint-segments; Tongue and groove joints; Tenon and mortise joints; Stepped joint cross-sections
    • B29C66/122—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section
    • B29C66/1224—Joint cross-sections combining only two joint-segments, i.e. one of the parts to be joined comprising only two joint-segments in the joint cross-section comprising at least a butt joint-segment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/14—Particular design of joint configurations particular design of the joint cross-sections the joint having the same thickness as the thickness of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5221—Joining tubular articles for forming coaxial connections, i.e. the tubular articles to be joined forming a zero angle relative to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/52—Joining tubular articles, bars or profiled elements
    • B29C66/522—Joining tubular articles
    • B29C66/5229—Joining tubular articles involving the use of a socket
    • B29C66/52291—Joining tubular articles involving the use of a socket said socket comprising a stop
    • B29C66/52292—Joining tubular articles involving the use of a socket said socket comprising a stop said stop being internal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
    • B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
    • B29C66/53—Joining single elements to tubular articles, hollow articles or bars
    • B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
    • B29C66/5344—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially annular, i.e. of finite length, e.g. joining flanges to tube ends
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/87—Auxiliary operations or devices
    • B29C66/872—Starting or stopping procedures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91315—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the current intensity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/912—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux
    • B29C66/9131—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux
    • B29C66/91311—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating
    • B29C66/91317—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by measuring the temperature, the heat or the thermal flux by measuring the heat or the thermal flux, i.e. the heat flux by measuring the heat generated by Joule heating or induction heating by measuring the electrical resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91651—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating
    • B29C66/91655—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux by controlling or regulating the heat generated by Joule heating or induction heating by controlling or regulating the current intensity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/967—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes
    • B29C66/9674—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving special data inputs or special data outputs, e.g. for monitoring purposes involving special data outputs, e.g. special data display means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
    • F16L47/02—Welded joints; Adhesive joints
    • F16L47/03—Welded joints with an electrical resistance incorporated in the joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid

Definitions

  • the invention relates to a method for making a welded connection of a line element to a connecting element.
  • connection of line elements made of a thermoplastic with the aid of a likewise thermoplastic connecting element provided with a heating element is generally known.
  • line elements are understood to mean pipeline parts, fittings and molded parts that are joined together by the connecting elements to form lines and line networks.
  • the connecting elements are often designed as electrofusion sockets and as electrically weldable connection and tapping clamps.
  • the connecting elements can also be used for connecting elements other than pipeline elements, e.g. for joining rod portions, but the use of weldable connecting elements in pipeline construction represents one of the most common application areas. To ensure that the joining of piping elements by means of such connecting elements is reliable, it is desirable to control the welding.
  • EP0173174A1 assumes that the quality of the weld is essentially dependent on the correct temperature in the welding region and the welding pressure generated during the welding process, i.e. the pressure exerted on the material plasticized by the heat supplied in the welding region. This is caused by the fact that the connecting element is given a shrinkage reserve, which results in shrinkage of the connecting element when the welding region is plasticized by the applied heat. This shrinkage, combined with the increase in volume of the material when the welding region is heated, causes this increase in pressure in the welding region.
  • connecting elements Since all circumstances that prevent the correct welding temperature and welding pressure from being reached represent a reduction in the quality of the welded connection, connecting elements have for some time been equipped with additional indicating means that are intended to provide information about the quality of the weld.
  • a color change dot is used which is placed on the outer socket surface and changes color when the body of the connecting element is sufficiently heated.
  • CH 553 368 it is known from CH 553 368 to place the color change dot at a location of lower wall thickness. But even in this case, only the temperature may be determined, not the welding pressure, and there is also the uncertainty that a color change can occur due to external heat influence.
  • This embodiment has proved particularly useful for relatively thin-walled connecting elements.
  • the protruding pin provides a relatively accurate measure of the temperature and welding pressure in the welding region.
  • this embodiment has the disadvantage that the depth of the bore is difficult to define. If the bottom of the bore is too close to the welding region, the movement of the pin occurs too early, but if the bottom of the bore is located away from the welding region, no movement of the pin occurs even though the welding pressure has been created.
  • EP1745917A1 and DE10225370A1 also each disclose electrofusion sockets for pipeline connections made of thermoplastics, wherein the electrofusion socket may be connected to a pipeline by means of an electrofusion process. To make the connection, a heating wire winding embedded in the electrofusion socket is connected to an external electrical power source, as a result of which the electrofusion socket is melted in certain regions.
  • the electrofusion sockets known from the prior art have the disadvantage that if the pipes are insufficiently inserted into the electrofusion socket, no sufficient connection may be made between the pipe and the electrofusion socket. This leads to leaky pipe connections. In addition, a pipe insufficiently inserted into the electrofusion socket can cause the electrofusion socket to overheat locally, which in the worst case can even lead to a fire. In the electrofusion sockets known from the prior art, an indicator for checking the correct positioning of the individual elements relative to each other is only inadequately solved.
  • the object of the present invention was to overcome the disadvantages of the prior art and to disclose an improved method for welding connecting elements.
  • thermoplastic line element to a connecting element.
  • the method comprises the steps of:
  • the welding device stops the welding of the connecting element to the at least one thermoplastic line element before the end of the planned welding duration if an error criterion is reached.
  • an error message is output by the welding device when an error criterion is reached.
  • the method according to the invention has the advantage that by stopping the welding process before the end of the planned welding duration when an error criterion is reached, local overheating of the connecting element and thus a critical situation, such as fire of a connecting element, may be prevented.
  • the measures according to the invention can increase safety when connecting line elements to the connecting element.
  • the error criterion is reached if a certain number of error messages are summed up in an error counter implemented in the welding device. This has the advantage that the error criterion is not reached by a single error message, which could occur, for example, due to a measurement error, but that the error criterion is only reached if it is certain that there is actually an error due to the increased number of error messages.
  • an error message is added to the error counter if an actual value of the welding current lies outside a target value tolerance of a target value of the welding current over an error period. This results in the surprising advantage that the error criterion may be easily detected.
  • an error message is added to the error counter if an actual value of the conductor resistance of the heating element lies outside a target value tolerance of a target value of the conductor resistance of the heating element over an error period.
  • the conductor resistance may be detected easily and reliably by means of the welding device. Surprisingly, the detection of the conductor resistance may be used to draw conclusions as to whether a correct weld has been made and thus whether the line element has been correctly joined to the connecting element.
  • the time frame of the error period is determined in dependence of the recorded information about the connecting element to be welded.
  • the switch-off criterion may be individually adapted to the connecting element to be welded.
  • Relevant information about the connecting element to be welded can include, for example, a diameter or an embodiment of the connecting element.
  • relevant information about the connecting element can include, for example, information about the length and diameter of the resistance heating wire.
  • the time frame of the error period is set between 1 sec and 40 sec, in particular between 5 sec and 30 sec, preferably between 8 sec and 12 sec. Especially within these limits it has been shown that a surprisingly reliable switch-off criterion may be achieved.
  • the target value tolerance of the target value of the welding current and/or the target value tolerance of the target value of the conductor resistance of the heating element is determined in dependence of the recorded information about the connecting element to be welded.
  • the switch-off criterion may be individually adapted to the connecting element to be welded.
  • Relevant information about the connecting element to be welded can include, for example, a diameter or a design of the connecting element.
  • relevant information about the connecting element can include, for example, information about length, diameter, as well as the specific resistance of the resistance heating wire.
  • the target value tolerance of the target value of the welding current and/or the target value tolerance of the target value of the conductor resistance of the heating element is between 0.1% and 10%, in particular between 1% and 5%, preferably between 1.5% and 3% of the amount of the respective target value. Particularly with a tolerance limit in this value range, it has surprisingly been shown that a reliable switch-off criterion may be achieved.
  • the error criterion is reached if more than two error messages, in particular more than three error messages, preferably more than five error messages are added in the error counter. Particularly within this tolerance range, it has surprisingly been shown that a reliable switch-off criterion may be achieved.
  • the target value tolerance of the target value of the conductor resistance of the heating element is defined exclusively at the bottom of the target value of the conductor resistance.
  • the error criterion is reached when four error messages are summed up in an error counter implemented in the welding device, wherein one error message is added to the error counter if, over an error period, an actual value of the conductor resistance of the heating element lies outside a target value tolerance of a target value of the conductor resistance of the heating element, wherein the time frame of the error period is set between 8 sec and 12 sec and wherein the target value tolerance of the target value of the conductor resistance of the heating element is between 1.5% and 3% of the amount of the respective target value.
  • the actual value of the welding current and/or the actual value of the conductor resistance of the heating element is/are interrogated in an interrogation interval between 0.01 sec and 10 sec, in particular between 0.1 sec and 5 sec, preferably between 0.9 sec and 1.2 sec. Especially an interrogation of the actual value in this time interval brings a sufficiently representative result about the correct progress of the welding.
  • a welding device for welding a thermoplastic line element to a connecting element, the welding device having a control unit and an input interface for inputting information about the connecting element to be welded, the input interface being coupled to the control unit.
  • the welding device is designed in such a way that the welding of the connecting element to the at least one thermoplastic line element may be stopped before the end of the planned welding duration and/or an error message may be output by the welding device if an error criterion is reached.
  • the welding device according to the invention has the advantage that the quality of the welds may be increased.
  • the input of information about the connecting element to be welded into the welding device may be done by manual input by a machine operator.
  • the input of information about the connecting element to be welded into the welding device is performed by detecting an information carrier attached to the connecting element, such as an RFID chip, or a barcode by means of the welding device.
  • the input of information about the connecting element to be welded into the welding device takes place by detecting the conductor resistance by means of the welding device.
  • the welding device is only designed for welding one type of connecting element.
  • the information about the connecting element to be welded is entered directly into the welding device by the manufacturer and does not need to be recorded separately for each welding process.
  • an input interface is provided on the welding device by means of which the information about the connecting element to be welded may be entered into the welding device.
  • the input interface may be, for example, a keyboard, an RFID reader, a barcode reader or the like.
  • FIG. 1 a sectional view of an embodiment of a connecting element of a welding assembly
  • FIG. 2 a a schematic representation of the time course of the current and voltage during the welding process of a correctly performed weld
  • FIG. 2 b a schematic representation of the time course of the internal resistance of the resistance heating wire during the welding process of a correctly performed weld
  • FIG. 3 a a schematic representation of the time course of the current and voltage during the welding process of a defectively performed weld
  • FIG. 3 b a schematic representation of the time course of the internal resistance of the resistance heating wire during the welding process of a defectively performed weld
  • FIG. 4 a detailed view of a first embodiment for achieving a switch-off criterion
  • FIG. 5 a detailed view of a second embodiment for achieving a switch-off criterion.
  • FIG. 1 shows a first embodiment of a welding arrangement 1 with a connecting element 2 connecting line elements 3 .
  • the connecting element 2 is in the form of an electrofusion socket, and the line elements 3 are in the form of pipes.
  • thermoplastic body 4 which a heating element 6 is arranged in a welding region 5
  • the heating element 6 may in particular be in the form of a resistance heating wire 7
  • the connecting element 2 serves to connect two line elements 3 and thus two welding regions 5 are formed in the body 4 the connecting element 2
  • One of the welding regions 5 is used here for welding the connecting element 2 to the first line element 3
  • a second of the welding regions 5 is used here for welding the connecting element 2 to the second line element 3 .
  • the heating element 6 has a first connection point 8 and a second connection point 9 each of which serves for connection to a welding device 10
  • the two connection points 8 , 9 may be formed in the region of the two longitudinal ends of the connecting element 2 shown in FIG. 1 , whereby both welding regions 5 may be heated simultaneously by means of the welding device 10
  • the welding regions 5 may be heated by applying an electric current and an electric voltage to the first connection point 8 and the second connection point 9 the heating element 6 means of the welding device 10 As a result of this and the conductor resistance of the heating element 6 heating element 6 .
  • first connection point 8 and a second connection point 9 welding device 10 are formed for each welding region 5 This enables each of the two welding regions 5 be heated individually and independently of one another, and a welded connection to be made separately between the connecting element 2 first line element 3 between the connecting element 2 and the second line element 3
  • an abutment 11 may be provided on the body 4 of the connecting element 2 serves to correctly position the two line elements 3 in the connecting element 2
  • the abutment 11 may be formed centrally in the connecting element 2
  • the welding device 10 a control unit 12 used to control the welding process or to control the welding device 10
  • the welding device 10 an input interface 13 which is coupled to the control unit 12
  • the input interface 13 used to record information about the connecting element 2 to be welded and/or about the line elements 3 welded.
  • the input interface 13 is designed as a scanner, which is used to record a barcode printed on the connecting element 2 .
  • the welding device 10 may include a display unit 14 used to output information to a machine operator.
  • the display unit 14 may be coupled to a control panel that is used to operate the welding machine 10 by a user.
  • an error counter 15 may be implemented in the control unit 12 which is used to record errors during the welding process.
  • the error counter 15 may be implemented in the programming of the control unit 12
  • FIG. 1 is used to describe the welding process for joining the thermoplastic line element 3 to the connecting element 2
  • the line elements 3 are inserted into the connecting element 2 Furthermore, information on the nature of the connecting element 2 entered into the welding device 10
  • connection point 8 and the second connection point 9 the connecting element 2 connected to the welding device 10 , so that welding of the connecting element 2 to the line element 3 possible.
  • FIG. 2 a shows the time course of the welding current 17 and the welding voltage 18 The elapsed time in seconds is shown on the abscissa. The amount of the welding current 17 amperes on the ordinate. The amount of the welding voltage 18 volts on the ordinate.
  • the welding voltage 18 is raised to a certain value when the welding device 10 activated for welding, and is subsequently kept constant at this value.
  • the welding current 17 may decrease as seen over the time course of the welding process, since a conductor resistance 19 heating wire 7 increases due to the heating of the resistance heating wire 7
  • the course of the welding current 17 as shown in FIG. 2 a is the course that occurs with a correctly welded connecting element 2 and was determined as the actual value 21 the welding current 17 with a correctly welded connecting element 2
  • the time course of the welding current 17 FIG. 2 a can thus be used as the target value 20 the welding current 17 a comparable connecting element 2
  • the actual value 21 of the welding current 17 is thus congruent with the target value 20 the welding current 17 .
  • the target value 20 the welding current 17 is different for each different embodiment of the connecting element 2
  • welding tests may be carried out with the individual different versions of the connecting element 2
  • a target value tolerance 22 may be calculated from the target value 20 the welding current 17 .
  • the target value tolerance 22 the welding current 17 may be arranged on a lower side 23 of the target value 20 current 17 and/or on an upper side 24 of the target value 20 welding current 17 Thus, deflections of the welding current 17 may be detected either only downwards or only upwards or both downwards and upwards.
  • the actual value 21 the welding current 17 may be interrogated at an interrogation interval 25 , with a measurement of the actual value 21 welding current 17 being made at intervals during the interrogation interval 25
  • FIG. 2 b shows the time course of the conductor resistance 19 over the welding process.
  • the elapsed time in seconds is shown on the abscissa.
  • the magnitude of the conductor resistance 19 ohms on the ordinate.
  • the conductor resistance 19 over the course of time.
  • the course of the conductor resistance 19 as shown in FIG. 2 b is the course that occurs with a correctly welded connecting element 2 and was determined as the actual value 27 the conductor resistance 19 with a correctly welded connecting element 2
  • the time course of the conductor resistance 19 FIG. 2 b can thus be used as the target value 26 the conductor resistance 19 a comparable connecting element 2
  • the actual value 27 resistance 19 is thus congruent with the target value 26 the conductor resistance 19 .
  • the actual value 27 the conductor resistance 19 increases over time as the resistance heating wire 7 progressively heated.
  • the target value 26 the conductor resistance 19 is different for each different embodiment of the connecting element 2
  • welding tests may be carried out with the individual different versions of the connecting element 2
  • a target value tolerance 28 the conductor resistance 19 may be calculated from the target value 26 the conductor resistance 19 , which may be used to check the correct welding.
  • the target value tolerance 28 the conductor resistance 19 may be arranged at a lower side 23 of the target value 26 resistance 19 and/or at an upper side 24 of the target value 26 19 Thus, deflections of the conductor resistance 19 may be detected either downward only, or upward only, or both downward and upward.
  • the actual value 27 the conductor resistance 19 may be interrogated at an interrogation interval 25 , with a measurement of the actual value 27 conductor resistance 19 being made at intervals during the interrogation interval 25
  • FIG. 3 a shows the time course of the welding current 17 the case of an incorrectly connected connecting element 2 , again using the same reference signs or element designations for the same elements as in the preceding FIG. 2 a . To avoid unnecessary repetition, reference is made to the detailed description in the preceding FIG. 2 a.
  • the actual value 21 of the welding current 17 may increase if two or more turns of the resistance heating wire 7 come into contact with each other and are thus short-circuited.
  • the actual value 21 welding current 17 may lie outside the target value tolerance 22 the welding current 17 whereby an error criterion may be determined.
  • FIG. 3 a shows the time course of the welding current 17 the case of an incorrectly connected connecting element 2 , again using the same reference signs or element designations for the same elements as in the preceding FIG. 2 a . To avoid unnecessary repetition, reference is made to the detailed description in the preceding FIG. 2 a.
  • FIG. 3 b shows the corresponding course of the actual value 27 the conductor resistance 19 an incorrectly welded connecting element 2 , again using the same reference signs or element designations for the same elements as in the preceding FIG. 2 b .
  • the actual value 27 conductor resistance 19 has fallen below the target value tolerance 28 arranged at the lower side 23 of the target value 26 conductor resistance 19 This may be used as an error criterion to stop the welding process prematurely and/or to output an error message.
  • FIG. 4 shows a detailed view of detail X from FIG. 3 b , again using the same reference signs or element designations for the same elements as in the preceding FIG. 3 b . To avoid unnecessary repetition, reference is made to the detailed description in the preceding FIG. 3 b.
  • an embodiment example is described of how an error criterion for stopping the welding process before the end of the planned welding duration may be defined.
  • this event may be referred to as a start event A. From this start event A, an error period 16 begins to run.
  • the error criterion is reached when a certain number of error messages are counted in the error counter 15 In the present example according to FIG. 4 , for example, there are three error messages.
  • FIG. 5 shows a further process sequence that can occur during a welding operation, again using the same reference signs or element designations for the same elements as in the preceding FIG. 3 b . To avoid unnecessary repetition, reference is made to the detailed description in the preceding FIG. 3 b.
  • the error period 16 may begin to run. However, if the actual value 27 the conductor resistance 19 returns within the target value tolerance 28 the conductor resistance 1916 no error message is output to the error counter 15 If the target value tolerance 28 conductor resistance 19 falls below the actual value 27 conductor resistance 19 again, the error period 16 starts running anew. Since in the present embodiment example there is an undershooting of the target value tolerance 28 over the complete error period 16 , an error message is transmitted to the error counter 15 at the end of the error period 16 Immediately following this second error period 16 a third error period 16 begins to run.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US17/275,066 2019-05-22 2019-05-22 Method for producing a welded connection, and welding device Active US11987010B2 (en)

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EP (1) EP3840941B1 (zh)
JP (1) JP2022540264A (zh)
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CH601719A5 (en) 1977-02-25 1978-07-14 Werner Sturm Electrically weldable thermoplastic sleeve for pipework, etc.
CH632078A5 (en) 1978-09-12 1982-09-15 Von Roll Ag Collar for connecting line elements
AU581014B2 (en) 1984-08-28 1989-02-09 Von Roll Ag Weldable connecting member for connecting or joining thermoplastic pipe elements
US4642155A (en) 1985-05-16 1987-02-10 Central Plastics Company Thermoplastic fitting electric heat welding method and apparatus
KR910005269B1 (ko) * 1988-11-04 1991-07-24 주식회사 삼해냉동 알파-감김미역 플레이크(flake)의 제조방법
JP2524666B2 (ja) * 1991-05-10 1996-08-14 積水化学工業株式会社 融着異常検知方法
JPH06190925A (ja) 1992-12-25 1994-07-12 Retsukisu Kogyo Kk 融着継手の制御装置
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JP2000035178A (ja) * 1998-07-22 2000-02-02 Hitachi Metals Ltd 電気融着継手およびその通電制御方法
DE10225370A1 (de) 2002-06-06 2003-12-18 Georg Fischer Wavin Ag Subinge Elektroschweissmuffe
EP1745917B1 (de) 2005-07-18 2013-03-06 Georg Fischer Wavin AG Elektroschweissmuffe
JP2009068717A (ja) * 2008-12-22 2009-04-02 Hitachi Metals Ltd 電気融着用コントローラ及びその通電制御方法
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AU2019446744A1 (en) 2021-05-27
WO2020232479A1 (de) 2020-11-26
KR102500263B1 (ko) 2023-02-17
EP3840941C0 (de) 2024-03-13
CN112912234A (zh) 2021-06-04
EP3840941B1 (de) 2024-03-13
KR20210059761A (ko) 2021-05-25
US11987010B2 (en) 2024-05-21
EP3840941A1 (de) 2021-06-30
JP2022540264A (ja) 2022-09-15

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